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“For decades, we’ve known of four fundamental forces: gravitation, electromagnetism, and the strong and weak nuclear forces.
originally posted by: ErosA433
a reply to: KrzYma
well they do do 1 on 1...
lots of particles in each bunch but the actual number of impacts at the interaction point is still very small...
Anyway, will be no point in talking with you in particular, your not exactly open to anything beyond 'EM is everything'
originally posted by: TommyD1966
User 'kashai' started a thread about planetary engineering. The question was can we cool Venus by effectively blocking the sun's radiation.
So, can something like Newton's law of cooling be used to figure this out? I briefly looked at it, but have a problem with the parameters/initial conditions.
So let's say that Venus is 500c. We know that most of the heat is due to the co2 in the atmosphere (greenhouse effect). Since it is 67,000,000 million miles from the sun, and we are about 93,000,000, then inverse square law says it gets, what, double the solar radiation we do?
So, can anyone figure out (roughly) how much Venus would cool in, say, a year assuming that it received no solar radiation in that time (so 'ambient' temperature would be not too much above absolute zero)?
Or would Newton's law of cooling not be applicable.
Can anyone do back-of-the-napkin swag on this?
originally posted by: mbkennel
It violates special theory only if you assume a local realistic theory based on local fields (like gravitation and electromagnetism). But QM isn't like that, it's in an incomprehensible (to human intuition) functional space, and that's what all the entanglement business is about.
Lol famous last words, but it has some merit.
originally posted by: mbkennel
Don't bet against Einstein.
originally posted by: KrzYma
I have a question, relativity related.
There is two planets, let's say ten thousand light years apart... right ?
And on both planets, there is intelligent lifeforms with telescopes, optical, radio, what so ever...
Planet A and Planet B
The technological development takes some time, so planet A sees planet B as primitive, 10k years back in time, right ?
Also planet B sees planet A 10K years back in time...
now... both, from our perspective in time, develop an spaceship that can go 99% of the speed of Einstein's absolute speed, the speed of light.
So.. a traveler from planet A and from planet B take a trip and arrive at the other planet after...
this is the question,
after what time seen from perspective of planet A, and after what time seen from perspective of planet B, and after what time seen from our perspective traveler A and traveler B arrive relative to planet A and B and our POV ?
This question requires six answers ( just a hint )
It doesn't apply to thermal radiation and that's how Venus would cool, via thermal radiation.
originally posted by: TommyD1966
Or would Newton's law of cooling not be applicable.
I think you could use the Stefan-Boltzmann law to calculate thermal emission, but you would need to know the effective emissivity, and I don't know the emissivity of Venus. I'm not sure if anybody knows, but for the proposed VERITAS mission, the "E" in Veritas stands for "Emissivity" which would be one of the mission goals to measure.
Can anyone do back-of-the-napkin swag on this?
The Venus Emissivity, Radio Science, InSAR, Topography And Spectroscopy (VERITAS) Mission, a proposed NASA Discovery mission, seeks to produce high-resolution altimetry and synthetic aperture radar (SAR) imaging, thermal emissivity, and an improved gravity field.
Whereas the Earth has an average surface temperature of 14 degrees Celsius, the average temperature of Venus is 460 degrees Celsius.
NASA’s Goddard Institute for Space Studies, in a report published Thursday in the journal Geophysical Research Letters, calculated that the average surface temperature 2.9 billion years ago was about 50 degrees Fahrenheit. Such temperature would have made Venus, surprisingly for a planet closer to the Sun, a bit chillier than Earth was at the time.
QM won. The Bell's theorem tests show actions at a distance that occur in a faster than light way..
The technological development takes some time, so planet A sees planet B as primitive, 10k years back in time, right ?
originally posted by: greenreflections
a reply to: delbertlarson
QM won. The Bell's theorem tests show actions at a distance that occur in a faster than light way..
What if Bell's theorem is a continuation (or combined with, or same thing) of uncertainty principle? Uncertainty principle states two descriptors cannot be known together on the same photon..., position and momentum, where Bell is introducing a single descriptor for two events?
Do I make any sense??
cheers)
originally posted by: micpsi
What some of you are missing is that quantum non-locality does not mean that "something" is travelling faster of light in order to generate the observed correlations between entangled quantum states, in violation of the predictions of Special Relativity. Where Einstein erred was in persisting in believing in classical realism, i.e., the central assumption of classical physics that matter - whatever form it takes - possesses definite, sharply defined properties before being observed.
The problem of understanding quantum mechanics arises from the fact that reality is non-local; the apparent realism of macroscopic, classical reality embedded in Einstein's space-time continuum is merely an illusion on the microscopic scale. Until physicists truly come to terms with the holistic nature of quatum systems, wherein it is not meaningful to treat their components as behaving classically, the tension between relativity and quantum theory will continue. Such paradox points towards the necessity of a more complete understanding of reality in order to resolve it. Physicists must start taking their gaze off the shadows on the cave wall and leave the cave itself. Then they will understand for the first time why local realism does not pertain outside the cave.
In the Everett Interpretation discussed by physicist Sean Carroll in the OP video, reality in our universe might be entirely local and nobody has proven that interpretation wrong to my knowledge though it's not philosophically pleasing, but as Carroll points out, some of the consequences of the alternatives are also not philosophically pleasing. The fact is nobody knows and we haven't figured out tests to solve the riddle of the correct interpretation of QM, though the Bell tests made some progress.
originally posted by: micpsi
What some of you are missing is that quantum non-locality does not mean that "something" is travelling faster of light in order to generate the observed correlations between entangled quantum states, in violation of the predictions of Special Relativity.
The tension continues because we don't have a model for quantum gravity, or whatever nature substitutes for that. The tension does not exist because physicists have some delusion that quantum objects behave classically, they clearly understand that's not the case, as described by this physics FAQ site:
Until physicists truly come to terms with the holistic nature of quatum systems, wherein it is not meaningful to treat their components as behaving classically, the tension between relativity and quantum theory will continue.
the cloud really is the state of the electron. It's not a picture of where some dot-like particle probably is. It isn't anywhere in particular. It also doesn't have any particular velocity. In a hydrogen atom, it's certainly not going in a circle. The cloud doesn't go anywhere at all. There's no reason for it to radiate.
The world at a small scale cannot be put together out of anything like the pictures we're used to at a large scale.